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Phone 7910 can´t make calls on CUCM 8.5

We are doing an upgrade of CUCM from 4.1 to 8.5 and the problem is that the phones 7910 G+SW are registered correctly to CUCM 8.5, can receive calls normally but can´t make calls.

The simptoms when we try to make a call are the follow:

- The phone have no dial tone.

- can´t press no digit.

- after 4 seconds the congestion tone is hear in the phone.

Actions already taken:

-We check 4 phones 7910. All have the same symptom.

-The firmware version P00405000700.sbn (signed) recommended by Cisco is installed by default in CUCM 8.5.

-Create new profiles for phones 7910. The result is the same.

Other tests:

-Web dialer works properly.

-Speed dialer works ok.

  • IP Telephony